A STUDY ON HEAT HISTORY OF ORGANIC ACCELERATORS IN RUBBER STOCK (BR BASE)

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  • ゴム配合中の有機加硫促進剤の熱履歴について
  • ゴム ハイゴウ チュウ ノ ユウキカリュウソクシンザイ ノ ネツ リレキ ニ ツイテ

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The test was carried out to compare and to see how the properties of un-cured compounds and vulcanisates vary under the influence of heat treatment at 100°C and 150°C respectively for 30 minutes of BR stocks mixed at normal temperature (below 70°C) that were blended with compounding ingredients including twelve kinds of organic accelerators but excluding sulfur.<br>As a result the accelerators in most cases were found unstable to the heat treatment. Among those that becomes liable to scorch are included CZ (N-cyclohexyl-2-benzothiazolesulfenamide), MSA (N-oxydiethylene benzothiazole-2-sulfenamide), DT (Di-0-tolyl guanidine) and among those in which the scorch time gradually extends are D (Diphenyl guanidine), TET (Tetraethylthiuram disulfide), TRA (Dipentamethylenethiuramtetrasulfide), EZ (Zn-diethyl dithiocarbamate) and PX(Zn-ethyl-phenyl dithiocarbamate). Those that do not vary under 100°C, but will extend the scorch time under 150°C are M (2-mercaptobenzothiazole), DM (Benzothiazyldisulfide), TT (Tetramethylthiuram disulfide) and TS (Tetramethylthiuram monosulfide).<br>It was also found that the stability to curing was good in DT which was less variable. Those that are comparatively good in this uspect are CZ, MSA, but, M, DM, D, TT, TS, TET would remarkably prevent curing function under 150°C while TRA, PX were found extremely unstable and would retard the cure under 100°C treatment.

Journal

  • NIPPON GOMU KYOKAISHI

    NIPPON GOMU KYOKAISHI 42 (4), 265-278, 1969

    THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN

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